Find value of this,if

[tex]x = 9 + 4 \sqrt{5} [/tex]

below is question

[tex]x ^{4} + \frac{1}{x^{4} } [/tex]

# Find value of this,if

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[tex]x ^{4} + \frac{1}{x^{4} } [/tex]

[tex]18 + \frac{1}{9 + 4 ^{ – 4} } [/tex]

[tex] \frac{18 \times (9 + 4^{ – 4} )}{9 + 4 ^{4} } [/tex]

=18